There is a section in this song where the band breaks into what I believe to be a jam in 'D'. I've not heard this break before in other Good Lovin's. Anyway, it's a powerful moment and adds tremendously to the show.
Like many moments in '76, it seems to have been a spur-of-the-moment thing, since they hadn't played it since Oct '74 (and then only once). The year is full of little unusual moments like that, where they jam in places you weren't expecting. Unfortunately when the song came back in '77, it was much more 'standardized'.